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Segments International Revenue (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Concentration Risk, Geographic                 66160000 61996 42719
Revenues $ 32,723 $ 29,913 $ 28,134 $ 27,021 $ 26,240 $ 25,208 $ 23,785 $ 21,406 $ 117,791 $ 96,639 $ 71,045
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]                 1    
International Revenue [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
percentage of total revenue                 56.00% 64.00% 60.00%
UNITED STATES
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]                 51631 34643 28326
percentage of total revenue                 44.00% 36.00% 40.00%
South America and Canada [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]                 5457 7863 3262
percentage of total revenue                 5.00% 8.00% 5.00%
Europe [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]                 31545 26608 16336
percentage of total revenue                 27.00% 28.00% 23.00%
Pacific [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 $ 15,356 $ 17,788 $ 12,829
percentage of total revenue                 13.00% 18.00% 18.00%
Middle East [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]                 10914 7275 4604
percentage of total revenue                 9.00% 8.00% 6.00%
Africa [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]                 2888